It is already too late in many ways. It should have happened before impeachment. With impeachment blending into pandemic blending into the election, not sure this story will ever get out to the public.
Barr's plan all along. Talk like a tough guy, drop some tantalizing quotes, tell people he's really really looking into it and he means REALLY looking into it, and wait for it to blow over. It's what he does about everything that's not deep state approved.